It is important (necessary,strange,impossible,natural) +that 从句" 中,that 后面的从句中的谓语动词用::(should) + 动词原形,should 可以省略,这是固定用法哦,用的是虚拟语气,记住就好 例句如下: It's necessary that we should have a walk now.我们有必要出去散散步. It's natural that she should do so.她这样做是很自然的. It's important that we should take good care of the patient. 重要的是我们要照顾好病人.